--  @testpoint:opengauss关键字c(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists c;
create function c(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function c;

--关键字带双引号-成功
drop function if exists "c";
create function "c"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "c";

--关键字带单引号-合理报错
drop function if exists 'c';
create function 'c'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `c`;
create function `c`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/